Detachable boiler-flue.



UNITED sTATEs PATENT oEEIcE.

OLE C. BORG-EN, OF SHARON, NORTH DAKOTA.

DETACHABLE BOILER-FLUE.

.To all 'whom it may concern:

Be it known that I, OLE C. BORGEN, a citizen of the United States, residing at Sharon, in the county of Steele and State of North Dakota, have invented certain new and useful Improvements in` Detachable Boiler-Fines; and I do hereby declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide an improved detachable boiler flue, and to this end it consists of the novel devices and combinations of devices hereinafter described and defined in the claim.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings, Figure 1 is a view partly in plan and partly in vertical section showing a iue applied to a flue sheet in accordance with my invention; and Fig. 2 is an end-elevation of the flue and coupling removed from the flue sheet.

The numeral 1 indicates the iue sheet and the numeral 2 the iue. The flue 1 is threaded at one end, as shown at 3, and the flue sheet 1 is provided with a threaded seat 4, through which the threaded end of the flue projects.

A coupling 5, having external threads 6 atk its inner end, for engagement with the threaded seat 4 of the flue sheet 1, and having internal threads 7 at its outer end for engagement with the threaded end 3 of the Hue 1, permits the coupling 5 to be screwed into the seat 4 of the flue sheet 1 and onto the threaded end 3 of the iiue 2.

The coupling 5 is provided, at its external intermediate portion, with an annular iiange 8, between which flange and the Hue sheet 1 a pliable gasket or packing 9 is interposed Specification of Letters Patent.

Application filed June 19, 1909.

Patented Oct. 25, 1910. Serial No. 503,173.

to insure a steam tight joint between the coupling 5 and the fiue sheet 1. The outer end of the coupling 5 is formed angular, or likea nut, so that it may be readily turned by the use of a wrench. The bore of the coupling 5, at its inner end, is increased in diameter to form a chamber 10 between the iiue 2 and the coupling 5, when the coupling 5 is screwed onto the flue 2 and into the seat 4 of the flue sheet 1.

By reference to Fig. 1, it will be noted that the chamber l() extends from the rear toward the front of the coupling 5 a distance beyond the outside of the flue sheet 1, thus permitting the free circulation of water around the flue 2 beyond the outside of the flue sheet l. The chamber 10 also prevents that portion of the coupling 5 between the flue sheetl and the flue 2 from binding, thus permitting the coupling 5 to be easily removed from its operative position.

What I claim is:

The combination with a iue sheet having a threaded seat, of a flue having a threaded end projecting through said flue sheet, a coupling having a projecting annular clamping iiange and internal and external threads permitting said coupling to be screwed into said seat and onto the threaded end of said flue and the bore of said coupling being increased in diameter at its inner end to form a chamber around that portion of the flue which lies in the plane of the iiue sheet, and a gasket clamped between said clamping iiange and the adjacent face of the flue sheet, substantially as described.

In testimony whereof I afiiX my signature in presence of two witnesses.

OLE C. BORGEN.

Witnesses:

E. Gr. QUAMME, C. G. LINNELL. 

